macOS: compile with symbols hidden by default.

platform/xcode/liblove.xcodeproj/project.pbxproj

@@ -4931,6 +4931,7 @@
 				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_OPTIMIZATION_LEVEL = 3;
 				GCC_PREPROCESSOR_DEFINITIONS = LOVE_APPLE_USE_FRAMEWORKS;
+				GCC_SYMBOLS_PRIVATE_EXTERN = YES;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = NO;
 				GCC_WARN_ABOUT_MISSING_FIELD_INITIALIZERS = YES;
 				GCC_WARN_ABOUT_MISSING_NEWLINE = YES;
@@ -4996,6 +4997,7 @@
 					LOVE_APPLE_USE_FRAMEWORKS,
 					"DEBUG=1",
 				);
+				GCC_SYMBOLS_PRIVATE_EXTERN = YES;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = NO;
 				GCC_WARN_ABOUT_MISSING_FIELD_INITIALIZERS = YES;
 				GCC_WARN_ABOUT_MISSING_NEWLINE = YES;
@@ -5136,6 +5138,7 @@
 				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_OPTIMIZATION_LEVEL = 3;
 				GCC_PREPROCESSOR_DEFINITIONS = LOVE_APPLE_USE_FRAMEWORKS;
+				GCC_SYMBOLS_PRIVATE_EXTERN = YES;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = NO;
 				GCC_WARN_ABOUT_MISSING_FIELD_INITIALIZERS = YES;
 				GCC_WARN_ABOUT_MISSING_NEWLINE = YES;

platform/xcode/love.xcodeproj/project.pbxproj

@@ -535,6 +535,7 @@
 				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_OPTIMIZATION_LEVEL = 0;
 				GCC_PREPROCESSOR_DEFINITIONS = LOVE_APPLE_USE_FRAMEWORKS;
+				GCC_SYMBOLS_PRIVATE_EXTERN = YES;
 				GCC_TREAT_IMPLICIT_FUNCTION_DECLARATIONS_AS_ERRORS = NO;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = NO;
 				GCC_WARN_ABOUT_MISSING_NEWLINE = NO;
@@ -607,6 +608,7 @@
 				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_OPTIMIZATION_LEVEL = 3;
 				GCC_PREPROCESSOR_DEFINITIONS = LOVE_APPLE_USE_FRAMEWORKS;
+				GCC_SYMBOLS_PRIVATE_EXTERN = YES;
 				GCC_TREAT_IMPLICIT_FUNCTION_DECLARATIONS_AS_ERRORS = NO;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = NO;
 				GCC_WARN_ABOUT_MISSING_NEWLINE = NO;
@@ -840,6 +842,7 @@
 				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_OPTIMIZATION_LEVEL = 3;
 				GCC_PREPROCESSOR_DEFINITIONS = LOVE_APPLE_USE_FRAMEWORKS;
+				GCC_SYMBOLS_PRIVATE_EXTERN = YES;
 				GCC_TREAT_IMPLICIT_FUNCTION_DECLARATIONS_AS_ERRORS = NO;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = NO;
 				GCC_WARN_ABOUT_MISSING_NEWLINE = NO;